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FRP, Fiberglass, & Composite Culvert Rehabilitation

Fiber Reinforced Plastic (FRP) culvert rehabilitation is the latest composite highway infrastructure repair technology pioneered by Kenway Composites. We design for steel culverts exceeding 3’0. Existing HDPE slip line methods and concrete invert liners come with extended installation schedules. Moreover, they have multiple negative impacts on the environment. Partnering with the University of Maine’s AEWC Advanced Structures and Composites Center, the Kenway developed a composite invert liner. The liner restores the original structural integrity of the culvert with minimal environmental impact and most importantly, a reduced installation cost. By using Kenway’s FRP culvert rehabilitation system, transportation departments can accomplish more maintenance projects with their existing budgets.


Advantages include:

  • Lower installed cost compared with concrete invert repairs;
  • Minimal traffic flow disruption – liners exceeding 100’ overall length fully installed in just 1-week
  • Reduced impact on culvert invert elevation
  • Minimal downstream environmental impact, particularly compared with concrete installations
  • Custom fabricated internal weirs and baffles available
  • Ability to complete culvert inert and/or overhead spot repairs
  • Extended service life
  • Integrated fish ladder options available